#include "includes.h"
uint16 global_smbpid;
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_LOCKING
+
/* the locking database handle */
static TDB_CONTEXT *tdb;
+static TDB_CONTEXT *deferred_open_tdb;
+
+struct locking_data {
+ union {
+ int num_share_mode_entries;
+ share_mode_entry dummy; /* Needed for alignment. */
+ } u;
+ /* the following two entries are implicit
+ share_mode_entry modes[num_share_mode_entries];
+ char file_name[];
+ */
+};
/****************************************************************************
Debugging aid :-).
/****************************************************************************
Utility function called to see if a file region is locked.
- If check_self is True, then checks on our own fd with the same locking context
- are still made. If check_self is False, then checks are not made on our own fd
- with the same locking context are not made.
****************************************************************************/
BOOL is_locked(files_struct *fsp,connection_struct *conn,
SMB_BIG_UINT count,SMB_BIG_UINT offset,
- enum brl_type lock_type, BOOL check_self)
+ enum brl_type lock_type)
{
int snum = SNUM(conn);
+ int strict_locking = lp_strict_locking(snum);
BOOL ret;
if (count == 0)
return(False);
- if (!lp_locking(snum) || !lp_strict_locking(snum))
+ if (!lp_locking(snum) || !strict_locking)
return(False);
- ret = !brl_locktest(fsp->dev, fsp->inode, fsp->fnum,
- global_smbpid, sys_getpid(), conn->cnum,
- offset, count, lock_type, check_self);
+ if (strict_locking == Auto) {
+ if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && (lock_type == READ_LOCK || lock_type == WRITE_LOCK)) {
+ DEBUG(10,("is_locked: optimisation - exclusive oplock on file %s\n", fsp->fsp_name ));
+ ret = 0;
+ } else if (LEVEL_II_OPLOCK_TYPE(fsp->oplock_type) && (lock_type == READ_LOCK)) {
+ DEBUG(10,("is_locked: optimisation - level II oplock on file %s\n", fsp->fsp_name ));
+ ret = 0;
+ } else {
+ ret = !brl_locktest(fsp->dev, fsp->inode, fsp->fnum,
+ global_smbpid, sys_getpid(), conn->cnum,
+ offset, count, lock_type);
+ }
+ } else {
+ ret = !brl_locktest(fsp->dev, fsp->inode, fsp->fnum,
+ global_smbpid, sys_getpid(), conn->cnum,
+ offset, count, lock_type);
+ }
DEBUG(10,("is_locked: brl start=%.0f len=%.0f %s for file %s\n",
(double)offset, (double)count, ret ? "locked" : "unlocked",
DEBUG(0,("ERROR: Failed to initialise locking database\n"));
return False;
}
-
+
+ if (!read_only && !deferred_open_tdb) {
+ deferred_open_tdb = tdb_open_log(lock_path("deferred_open.tdb"),
+ 0, TDB_DEFAULT|TDB_CLEAR_IF_FIRST,
+ O_RDWR|O_CREAT,
+ 0644);
+
+ if (!deferred_open_tdb) {
+ DEBUG(0,("ERROR: Failed to initialise deferred open database\n"));
+ tdb_close(tdb);
+ tdb = NULL;
+ return False;
+ }
+ }
+
if (!posix_locking_init(read_only))
return False;
BOOL locking_end(void)
{
+ BOOL ret = True;
brl_shutdown(open_read_only);
if (tdb) {
-
if (tdb_close(tdb) != 0)
- return False;
+ ret = False;
}
- return True;
+ if (deferred_open_tdb) {
+ if (tdb_close(tdb) != 0)
+ ret = False;
+ }
+
+ return ret;
}
/*******************************************************************
data = (struct locking_data *)dbuf.dptr;
num_share_modes = data->u.num_share_mode_entries;
if(num_share_modes) {
+ pstring fname;
int i;
int del_count = 0;
return 0;
}
+ /* Save off the associated filename. */
+ pstrcpy(fname, dbuf.dptr + sizeof(*data) + num_share_modes * sizeof(share_mode_entry));
+
/*
* Ensure that each entry has a real process attached.
*/
i++;
} else {
DEBUG(10,("get_share_modes: deleted %s\n", share_mode_str(i, entry_p) ));
- memcpy( &shares[i], &shares[i+1],
- sizeof(share_mode_entry) * (num_share_modes - i - 1));
+ if (num_share_modes - i - 1 > 0) {
+ memcpy( &shares[i], &shares[i+1],
+ sizeof(share_mode_entry) * (num_share_modes - i - 1));
+ }
num_share_modes--;
del_count++;
}
if (del_count) {
data->u.num_share_mode_entries = num_share_modes;
- if (num_share_modes)
+ if (num_share_modes) {
memcpy(dbuf.dptr + sizeof(*data), shares,
num_share_modes * sizeof(share_mode_entry));
+ /* Append the filename. */
+ pstrcpy(dbuf.dptr + sizeof(*data) + num_share_modes * sizeof(share_mode_entry), fname);
+ }
/* The record has shrunk a bit */
dbuf.dsize -= del_count * sizeof(share_mode_entry);
- if (tdb_store(tdb, key, dbuf, TDB_REPLACE) == -1) {
- SAFE_FREE(shares);
- SAFE_FREE(dbuf.dptr);
- return 0;
+ if (data->u.num_share_mode_entries == 0) {
+ if (tdb_delete(tdb, key) == -1) {
+ SAFE_FREE(shares);
+ SAFE_FREE(dbuf.dptr);
+ return 0;
+ }
+ } else {
+ if (tdb_store(tdb, key, dbuf, TDB_REPLACE) == -1) {
+ SAFE_FREE(shares);
+ SAFE_FREE(dbuf.dptr);
+ return 0;
+ }
}
}
}
if (ppse)
*ppse = memdup(&shares[i], sizeof(*shares));
data->u.num_share_mode_entries--;
- memmove(&shares[i], &shares[i+1],
- dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*shares)));
+ if ((dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*shares))) > 0) {
+ memmove(&shares[i], &shares[i+1],
+ dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*shares)));
+ }
del_count++;
DEBUG(10,("del_share_entry: deleting entry %d\n", i ));
pstrcat(fname, fsp->fsp_name);
size = sizeof(*data) + sizeof(share_mode_entry) + strlen(fname) + 1;
- p = (char *)malloc(size);
+ p = (char *)SMB_MALLOC(size);
if (!p)
return False;
data = (struct locking_data *)p;
fsp->fsp_name, data->u.num_share_mode_entries ));
size = dbuf.dsize + sizeof(share_mode_entry);
- p = malloc(size);
+ p = SMB_MALLOC(size);
if (!p) {
SAFE_FREE(dbuf.dptr);
return False;
return True;
}
+/*******************************************************************
+ Print out a deferred open entry.
+********************************************************************/
+
+char *deferred_open_str(int num, deferred_open_entry *e)
+{
+ static pstring de_str;
+
+ slprintf(de_str, sizeof(de_str)-1, "deferred_open_entry[%d]: \
+pid = %lu, mid = %u, dev = 0x%x, inode = %.0f, port = %u, time = [%u.%06u]",
+ num, (unsigned long)e->pid, (unsigned int)e->mid, (unsigned int)e->dev, (double)e->inode,
+ (unsigned int)e->port,
+ (unsigned int)e->time.tv_sec, (unsigned int)e->time.tv_usec );
+
+ return de_str;
+}
+
+/* Internal data structures for deferred opens... */
+
+struct de_locking_key {
+ char name[4];
+ SMB_DEV_T dev;
+ SMB_INO_T inode;
+};
+
+struct deferred_open_data {
+ union {
+ int num_deferred_open_entries;
+ deferred_open_entry dummy; /* Needed for alignment. */
+ } u;
+ /* the following two entries are implicit
+ deferred_open_entry de_entries[num_deferred_open_entries];
+ char file_name[];
+ */
+};
+
+/*******************************************************************
+ Print out a deferred open table.
+********************************************************************/
+
+static void print_deferred_open_table(struct deferred_open_data *data)
+{
+ int num_de_entries = data->u.num_deferred_open_entries;
+ deferred_open_entry *de_entries = (deferred_open_entry *)(data + 1);
+ int i;
+
+ for (i = 0; i < num_de_entries; i++) {
+ deferred_open_entry *entry_p = &de_entries[i];
+ DEBUG(10,("print_deferred_open_table: %s\n", deferred_open_str(i, entry_p) ));
+ }
+}
+
+
+/*******************************************************************
+ Form a static deferred open locking key for a dev/inode pair.
+******************************************************************/
+
+static TDB_DATA deferred_open_locking_key(SMB_DEV_T dev, SMB_INO_T inode)
+{
+ static struct de_locking_key key;
+ TDB_DATA kbuf;
+
+ memset(&key, '\0', sizeof(key));
+ memcpy(&key.name[0], "DOE", 4);
+ key.dev = dev;
+ key.inode = inode;
+ kbuf.dptr = (char *)&key;
+ kbuf.dsize = sizeof(key);
+ return kbuf;
+}
+
+/*******************************************************************
+ Get all deferred open entries for a dev/inode pair.
+********************************************************************/
+
+int get_deferred_opens(connection_struct *conn,
+ SMB_DEV_T dev, SMB_INO_T inode,
+ deferred_open_entry **pp_de_entries)
+{
+ TDB_DATA dbuf;
+ struct deferred_open_data *data;
+ int num_de_entries;
+ deferred_open_entry *de_entries = NULL;
+ TDB_DATA key = deferred_open_locking_key(dev, inode);
+
+ *pp_de_entries = NULL;
+
+ dbuf = tdb_fetch(deferred_open_tdb, key);
+ if (!dbuf.dptr)
+ return 0;
+
+ data = (struct deferred_open_data *)dbuf.dptr;
+ num_de_entries = data->u.num_deferred_open_entries;
+ if(num_de_entries) {
+ pstring fname;
+ int i;
+ int del_count = 0;
+
+ de_entries = (deferred_open_entry *)memdup(dbuf.dptr + sizeof(*data),
+ num_de_entries * sizeof(deferred_open_entry));
+
+ if (!de_entries) {
+ SAFE_FREE(dbuf.dptr);
+ return 0;
+ }
+
+ /* Save off the associated filename. */
+ pstrcpy(fname, dbuf.dptr + sizeof(*data) + num_de_entries * sizeof(deferred_open_entry));
+
+ /*
+ * Ensure that each entry has a real process attached.
+ */
+
+ for (i = 0; i < num_de_entries; ) {
+ deferred_open_entry *entry_p = &de_entries[i];
+ if (process_exists(entry_p->pid)) {
+ DEBUG(10,("get_deferred_opens: %s\n", deferred_open_str(i, entry_p) ));
+ i++;
+ } else {
+ DEBUG(10,("get_deferred_opens: deleted %s\n", deferred_open_str(i, entry_p) ));
+ if (num_de_entries - i - 1 > 0) {
+ memcpy( &de_entries[i], &de_entries[i+1],
+ sizeof(deferred_open_entry) * (num_de_entries - i - 1));
+ }
+ num_de_entries--;
+ del_count++;
+ }
+ }
+
+ /* Did we delete any ? If so, re-store in tdb. */
+ if (del_count) {
+ data->u.num_deferred_open_entries = num_de_entries;
+
+ if (num_de_entries) {
+ memcpy(dbuf.dptr + sizeof(*data), de_entries,
+ num_de_entries * sizeof(deferred_open_entry));
+ /* Append the filename. */
+ pstrcpy(dbuf.dptr + sizeof(*data) + num_de_entries * sizeof(deferred_open_entry), fname);
+ }
+
+ /* The record has shrunk a bit */
+ dbuf.dsize -= del_count * sizeof(deferred_open_entry);
+
+ if (data->u.num_deferred_open_entries == 0) {
+ if (tdb_delete(deferred_open_tdb, key) == -1) {
+ SAFE_FREE(de_entries);
+ SAFE_FREE(dbuf.dptr);
+ return 0;
+ }
+ } else {
+ if (tdb_store(deferred_open_tdb, key, dbuf, TDB_REPLACE) == -1) {
+ SAFE_FREE(de_entries);
+ SAFE_FREE(dbuf.dptr);
+ return 0;
+ }
+ }
+ }
+ }
+
+ SAFE_FREE(dbuf.dptr);
+ *pp_de_entries = de_entries;
+ return num_de_entries;
+}
+
+/*******************************************************************
+ Check if two deferred open entries are identical.
+********************************************************************/
+
+static BOOL deferred_open_entries_identical( deferred_open_entry *e1, deferred_open_entry *e2)
+{
+ return (e1->pid == e2->pid &&
+ e1->mid == e2->mid &&
+ e1->port == e2->port &&
+ e1->dev == e2->dev &&
+ e1->inode == e2->inode &&
+ e1->time.tv_sec == e2->time.tv_sec &&
+ e1->time.tv_usec == e2->time.tv_usec);
+}
+
+/*******************************************************************
+ Delete a specific deferred open entry.
+ Ignore if no entry deleted.
+********************************************************************/
+
+BOOL delete_deferred_open_entry(deferred_open_entry *entry)
+{
+ TDB_DATA dbuf;
+ struct deferred_open_data *data;
+ int i, del_count=0;
+ deferred_open_entry *de_entries;
+ BOOL ret = True;
+ TDB_DATA key = deferred_open_locking_key(entry->dev, entry->inode);
+
+ /* read in the existing share modes */
+ dbuf = tdb_fetch(deferred_open_tdb, key);
+ if (!dbuf.dptr)
+ return -1;
+
+ data = (struct deferred_open_data *)dbuf.dptr;
+ de_entries = (deferred_open_entry *)(dbuf.dptr + sizeof(*data));
+
+ /*
+ * Find any with this pid and delete it
+ * by overwriting with the rest of the data
+ * from the record.
+ */
+
+ DEBUG(10,("delete_deferred_open_entry: num_deferred_open_entries = %d\n",
+ data->u.num_deferred_open_entries ));
+
+ for (i=0;i<data->u.num_deferred_open_entries;) {
+ if (deferred_open_entries_identical(&de_entries[i], entry)) {
+ DEBUG(10,("delete_deferred_open_entry: deleted %s\n",
+ deferred_open_str(i, &de_entries[i]) ));
+
+ data->u.num_deferred_open_entries--;
+ if ((dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*de_entries))) > 0) {
+ memmove(&de_entries[i], &de_entries[i+1],
+ dbuf.dsize - (sizeof(*data) + (i+1)*sizeof(*de_entries)));
+ }
+ del_count++;
+
+ DEBUG(10,("delete_deferred_open_entry: deleting entry %d\n", i ));
+
+ } else {
+ i++;
+ }
+ }
+
+ SMB_ASSERT(del_count == 0 || del_count == 1);
+
+ if (del_count) {
+ /* the record may have shrunk a bit */
+ dbuf.dsize -= del_count * sizeof(*de_entries);
+
+ /* store it back in the database */
+ if (data->u.num_deferred_open_entries == 0) {
+ if (tdb_delete(deferred_open_tdb, key) == -1)
+ ret = False;
+ } else {
+ if (tdb_store(deferred_open_tdb, key, dbuf, TDB_REPLACE) == -1)
+ ret = False;
+ }
+ }
+ DEBUG(10,("delete_deferred_open_entry: Remaining table.\n"));
+ print_deferred_open_table((struct deferred_open_data*)dbuf.dptr);
+ SAFE_FREE(dbuf.dptr);
+ return ret;
+}
+
+/*******************************************************************
+ Fill a deferred open entry.
+********************************************************************/
+
+static void fill_deferred_open(char *p, uint16 mid, struct timeval *ptv, SMB_DEV_T dev, SMB_INO_T inode, uint16 port)
+{
+ deferred_open_entry *e = (deferred_open_entry *)p;
+ void *x = &e->time; /* Needed to force alignment. p may not be aligned.... */
+
+ memset(e, '\0', sizeof(deferred_open_entry));
+ e->mid = mid;
+ e->pid = sys_getpid();
+ memcpy(x, ptv, sizeof(struct timeval));
+ e->dev = dev;
+ e->inode = inode;
+ e->port = port;
+}
+
+/*******************************************************************
+ Add a deferred open record. Return False on fail, True on success.
+********************************************************************/
+
+BOOL add_deferred_open(uint16 mid, struct timeval *ptv, SMB_DEV_T dev, SMB_INO_T inode, uint16 port, const char *fname)
+{
+ TDB_DATA dbuf;
+ struct deferred_open_data *data;
+ char *p=NULL;
+ int size;
+ TDB_DATA key = deferred_open_locking_key(dev, inode);
+ BOOL ret = True;
+
+ /* read in the existing deferred open records if any */
+ dbuf = tdb_fetch(deferred_open_tdb, key);
+ if (!dbuf.dptr) {
+ size_t offset;
+ /* we'll need to create a new record */
+
+ size = sizeof(*data) + sizeof(deferred_open_entry) + strlen(fname) + 1;
+ p = (char *)SMB_MALLOC(size);
+ if (!p)
+ return False;
+ data = (struct deferred_open_data *)p;
+ data->u.num_deferred_open_entries = 1;
+
+ DEBUG(10,("add_deferred_open: creating entry for file %s. num_deferred_open_entries = 1\n",
+ fname ));
+
+ offset = sizeof(*data) + sizeof(deferred_open_entry);
+ safe_strcpy(p + offset, fname, size - offset - 1);
+ fill_deferred_open(p + sizeof(*data), mid, ptv, dev, inode, port);
+ dbuf.dptr = p;
+ dbuf.dsize = size;
+ if (tdb_store(deferred_open_tdb, key, dbuf, TDB_REPLACE) == -1)
+ ret = False;
+
+ print_deferred_open_table((struct deferred_open_data *)p);
+
+ SAFE_FREE(p);
+ return ret;
+ }
+
+ /* we're adding to an existing entry - this is a bit fiddly */
+ data = (struct deferred_open_data *)dbuf.dptr;
+
+ data->u.num_deferred_open_entries++;
+
+ DEBUG(10,("add_deferred_open: adding entry for file %s. new num_deferred_open_entries = %d\n",
+ fname, data->u.num_deferred_open_entries ));
+
+ size = dbuf.dsize + sizeof(deferred_open_entry);
+ p = SMB_MALLOC(size);
+ if (!p) {
+ SAFE_FREE(dbuf.dptr);
+ return False;
+ }
+ memcpy(p, dbuf.dptr, sizeof(*data));
+ fill_deferred_open(p + sizeof(*data), mid, ptv, dev, inode, port);
+ memcpy(p + sizeof(*data) + sizeof(deferred_open_entry), dbuf.dptr + sizeof(*data),
+ dbuf.dsize - sizeof(*data));
+ SAFE_FREE(dbuf.dptr);
+ dbuf.dptr = p;
+ dbuf.dsize = size;
+ if (tdb_store(deferred_open_tdb, key, dbuf, TDB_REPLACE) == -1)
+ ret = False;
+ print_deferred_open_table((struct deferred_open_data *)p);
+ SAFE_FREE(p);
+ return ret;
+}
+
/****************************************************************************
Traverse the whole database with this function, calling traverse_callback
on each share mode
SHAREMODE_FN(traverse_callback) = (SHAREMODE_FN_CAST())state;
+ /* Ensure this is a locking_key record. */
+ if (kbuf.dsize != sizeof(struct locking_key))
+ return 0;
+
data = (struct locking_data *)dbuf.dptr;
shares = (share_mode_entry *)(dbuf.dptr + sizeof(*data));
name = dbuf.dptr + sizeof(*data) + data->u.num_share_mode_entries*sizeof(*shares);
git.samba.org / samba.git / blobdiff